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Manual merging is also required when automatic merging runs into a change conflict; for instance, very few automatic merge tools can merge two changes to the same line of code (say, one that changes a function name, and another that adds a comment). In these cases, revision control systems resort to the user to specify the intended merge result.
Git does periodic repacking automatically, but manual repacking is also possible with the git gc command. [46] For data integrity, both the packfile and its index have an SHA-1 checksum [47] inside, and the file name of the packfile also contains an SHA-1 checksum. To check the integrity of a repository, run the git fsck command. [48] [49]
Version control systems attach metadata to changesets. Typical metadata includes a description provided by the programmer (a "commit message" in Git lingo), the name of the author, the date of the commit, etc. [9] Unique identifiers are an important part of the metadata which version control systems attach to changesets.
The granularity of control varies. Subversion, for example, can be configured to handle EOLs differently according to the file type, whereas Perforce converts all text files according to a single, per-client setting. Tags: indicates if meaningful names can be given to specific revisions, regardless of whether these names are called tags or labels.
Git [open, distributed] – designed by Linus Torvalds for Linux kernel development; decentralized; goals: fast, flexible, and robust [1] Global Design Platform (GDP) [proprietary, client-server] – design data management for IC design and Perforce infrastructure support; Integrity [proprietary, client-server]
To commit a change in git on the command line, assuming git is installed, the following command is run: [1] git commit -m 'commit message' This is also assuming that the files within the current directory have been staged as such: [2] git add . The above command adds all of the files in the working directory to be staged for the git commit.
Version control (also known as revision control, source control, and source code management) is the software engineering practice of controlling, organizing, and tracking different versions in history of computer files; primarily source code text files, but generally any type of file.
A delta can be defined in 2 ways, symmetric delta and directed delta.A symmetric delta can be expressed as (,) = (),where and represent two versions.. A directed delta, also called a change, is a sequence of (elementary) change operations which, when applied to one version , yields another version (note the correspondence to transaction logs in databases).